1906. 



NATURAL SCIENCES OF PHILADELPHIA. 



133 



Total lengthl Length \ 

 of penis, I of penis Length 



epiphallus \ (to insertion of 



and of vas vagina, 



flagellum. \ deferens'). 



Length ! 

 of sperm a- Museum 

 theca with number, 

 duct. 



Proceedings of the Academy of Natural Sciences 

 of Pliiladelphia, 1906. 



Page 183 — Under heading Length of Spermatheea with duct, first line 

 of table, change 5 to 50. On last Hue of table change 1.5 to 15. 



Distribution, eastern division of the Lower Sonoran in Texas. 

 Originally described from ''Washington and DeWitt counties, Texas." 

 Specimens from both of these are before us, and also from Hays, 

 Comal, Guadalupe, Bexar, Medina, Frio, Uvalde and Victoria counties. 

 Some shells from Fort Worth and Waco, in northern Texas, are also 

 like mooreanus, while others resemble B. d. liquabilis. 



B. d. mooreanus is smaller, thinner and smoother than the Mexican 

 B. schiedeanus (Pfr.), but intergrades with B. d. liquahilis Rve. through 

 certain specimens having ragged dark streaks, chiefly on the spire, 

 such as fig. 5 of pi. VI. In the main, the subspecies is quite uniform 



